<template>
  <div>
    <!-- 面包屑导航组件 -->
    <el-breadcrumb separator-class='el-icon-arrow-right'>
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域-->
    <el-card>
      <!-- 警告区域-->
      <el-alert
        title='只允许为三级分类设置相关参数'
        type='warning' :closable='false' show-icon>
      </el-alert>

      <el-row class='cat_opt'>
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model='selectedCateKeys'
            :options='cateList'
            :props='cateProps'
            change-on-select
            @change='getParamsData'></el-cascader>
        </el-col>
      </el-row>

      <!-- tab页签区域 -->
      <el-tabs v-model='activeName' @tab-click='handleTabClick'>
        <!-- 添加动态参数的面板 将标签页改为many -->
        <el-tab-pane label='动态参数' name='many'>
          <el-button size='mini' type='primary' :disabled='isButtonDisabled' @click='addDialogVisible = true'>添加参数
          </el-button>
          <!-- 动态参数表格 -->
          <el-table :data='manyTableData' border stripe>
            <!-- 展开行 -->
            <el-table-column type='expand'>
              <template v-slot='scope'>
                <!--                循环渲染tag标签-->
                <el-tag v-for='(item, i) in scope.row.attr_vals' :key='i' closable @close='handleClose(i,scope.row)'>
                  {{ item }}
                </el-tag>
                <!--                输入文本框-->
                <el-input
                  class='input-new-tag'
                  v-if='scope.row.inputVisible'
                  v-model='scope.row.inputValue'
                  ref='saveTagInput'
                  size='small'
                  @keyup.enter.native='handleInputConfirm(scope.row)'
                  @blur='handleInputConfirm(scope.row)'
                >
                </el-input>
                <!--                添加tag的按钮-->
                <el-button v-else class='button-new-tag' size='small' @click='showInput(scope.row)'>+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label='#' type='index'></el-table-column>
            <el-table-column label='参数名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope='scope'>
                <el-button size='mini' type='primary' icon='el-icon-edit' @click='showEditDialog(scope.row.attr_id)'>
                  编辑
                </el-button>
                <el-button size='mini' type='danger' icon='el-icon-delete' @click='removeParams(scope.row.attr_id)'>删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 将标签页改为only -->
        <el-tab-pane label='静态属性' name='only'>
          <el-button size='mini' type='primary' :disabled='isButtonDisabled' @click='addDialogVisible = true'>添加属性
          </el-button>
          <!-- 静态属性表格 -->
          <el-table :data='onlyTableData' border stripe>
            <!-- 展开行 -->
            <el-table-column type='expand'>
              <template v-slot='scope'>
                <!--                循环渲染tag标签-->
                <el-tag v-for='(item, i) in scope.row.attr_vals' :key='i' closable @close='handleClose(i,scope.row)'>
                  {{ item }}
                </el-tag>
                <!--                输入文本框-->
                <el-input
                  class='input-new-tag'
                  v-if='scope.row.inputVisible'
                  v-model='scope.row.inputValue'
                  ref='saveTagInput'
                  size='small'
                  @keyup.enter.native='handleInputConfirm(scope.row)'
                  @blur='handleInputConfirm(scope.row)'
                >
                </el-input>
                <!--                添加tag的按钮-->
                <el-button v-else class='button-new-tag' size='small' @click='showInput(scope.row)'>+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label='#' type='index'></el-table-column>
            <el-table-column label='属性名称' prop='attr_name'></el-table-column>
            <el-table-column label='操作'>
              <template slot-scope='scope'>
                <el-button size='mini' type='primary' icon='el-icon-edit' @click='showEditDialog(scope.row.attr_id)'>
                  编辑
                </el-button>
                <el-button size='mini' type='danger' icon='el-icon-delete' @click='removeParams(scope.row.attr_id)'>删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!--    添加参数对话框-->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync='addDialogVisible'
      @close='addDialogClosed'
      width='50%'>
      <!-- 添加表单 -->
      <el-form :model='addForm' :rules='addFormRules' ref='addFormRef' label-width='100px'>
        <el-form-item :label='titleText' prop='attr_name'>
          <el-input v-model='addForm.attr_name'></el-input>
        </el-form-item>
      </el-form>
      <span slot='footer' class='dialog-footer'>
    <el-button @click='addDialogVisible = false'>取 消</el-button>
    <el-button type='primary' @click='addParams'>确 定</el-button>
  </span>

    </el-dialog>
    <!-- 修改参数或属性对话框 -->
    <el-dialog :title="'修改'+titleText" :visible.sync='editDialogVisible' width='50%' @close='editDialogClosed'>
      <!-- 添加表单 -->
      <el-form :model='editForm' :rules='editFormRules' ref='editFormRef' label-width='100px'>
        <el-form-item :label='titleText' prop='attr_name'>
          <el-input v-model='editForm.attr_name'></el-input>
        </el-form-item>
      </el-form>
      <span slot='footer' class='dialog-footer'>
    <el-button @click='editDialogVisible = false'>取 消</el-button>
    <el-button type='primary' @click='editParams'>确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'Params',
  data() {
    return {
      // 分类列表
      cateList: [],
      // 用户在级联下拉菜单中选中的分类id
      selectedCateKeys: [],
      // 配置级联菜单中数据如何展示
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // tab页签激活显示的页签项
      activeName: 'many',
      // 用来保存动态参数数据
      manyTableData: [],
      // 用来保存静态属性数据
      onlyTableData: [],
      // 添加参数对话框显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单验证规则
      addFormRules: {
        attr_name: [{
          required: true,
          message: '请输入名称',
          trigger: 'blur'
        }]
      },
      // 控制修改参数.属性对话框的显示或隐藏
      editDialogVisible: false,
      // 修改参数.属性对话框中的表单
      editForm: {
        attr_name: ''
      },
      // 修改表单的验证规则
      editFormRules: {
        attr_name: [
          {
            required: true,
            message: '请输入名称',
            trigger: 'blur'
          }
        ]
      },
      // 默认情况下隐藏文本框
      inputVisible: false,
      // 文本框输入内容
      inputValue: ''
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      // 获取所有的商品分类列表
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取分类数据失败')
      }
      // 将数据列表赋值给cateList
      this.cateList = res.data
      // //保存总数据条数
      // this.total = res.data.total
      //   console.log(res.data);
    },
    async getParamsData() {
      // 当用户在级联菜单中选择内容改变时触发
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 当用户在级联菜单中选择内容改变时触发
      console.log(this.selectedCateKeys)
      // 发送请求，根据用户选择的三级分类和面板获取参数数据
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表数据失败')
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 添加一个bool值控制文本框的显示或者隐藏
        item.inputVisible = false
        // 添加一个inputValue保存文本框值
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        // 获取的是动态参数
        this.manyTableData = res.data
      } else if (this.activeName === 'only') {
        // 获取的是静态属性
        this.onlyTableData = res.data
      }
    },
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    addParams() {
      // 当用户点击对话框中的确定时，校验表单
      this.$refs.addFormRef.validate(async valid => {
        // 校验不通过，return
        if (!valid) return
        // 校验通过，发送请求完成添加参数或者属性
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )

        console.log(res)
        if (res.meta.status !== 201) {
          this.addDialogVisible = false
          return this.$message.error('添加' + this.titleText + '数据失败')
        }
        this.$message.success('添加' + this.titleText + '数据成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    async showEditDialog(attrId) {
      // 发起请求获取需要修改的那个参数数据
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`,
        { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数数据失败')
      }
      this.editForm = res.data
      // 显示修改参数.属性对话框
      this.editDialogVisible = true
    },
    editDialogClosed() {
      // 当关闭修改参数.属性对话框时
      this.$refs.editFormRef.resetFields()
    },
    editParams() {
      // 验证表单
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return

        // 发送请求完成修改
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          })

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数数据失败')
        }
        this.$message.success('修改' + this.titleText + '数据成功')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    async removeParams(attrId) {
      // 根据id删除对应的参数或属性
      // 弹窗提示用户是否要删除
      const confirmResult = await this.$confirm(
        '请问是否要删除该' + this.titleText,
        '删除提示',
        {
          confirmButtonText: '确认删除',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      // 如果用户点击确认，则confirmResult 为'confirm'
      // 如果用户点击取消, 则confirmResult获取的就是catch的错误消息'cancel'
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }

      // 没有取消就是要删除，发送请求完成删除
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数数据失败')
      }
      this.$message.success('删除' + this.titleText + '数据成功')
      this.getParamsData()
    },
    // 文本框失去焦点或按下enter键
    handleInputConfirm(row) {
      // 当用户在文本框中按下enter键或者焦点离开时都会触发执行
      // 判断用户在文本框中输入的内容是否合法
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果用户输入了真实合法的数据，需要保存起来
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false

      this.saveAttrVals(row)
    },
    // 显示文本框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick:在页面上元素被重新渲染之后，调用回调函数的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    handleClose(index, row) {
      // 删除对应索引的参数可选项
      row.attr_vals.splice(index, 1)
      // 调用函数，完成保存可选项的操作
      this.saveAttrVals(row)
    },
    async saveAttrVals(row) {
      // 封装函数，完成保存可选项的操作
      // 发起请求，保存参数细项
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(',')
        })

      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      }

      this.$message.success('修改参数项成功')
    }
  },
  computed: {
    // 添加计算属性用来获取按钮禁用与否
    isButtonDisabled() {
      return this.selectedCateKeys.length !== 3
    },
    // 获取选中的三级分类id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[this.selectedCateKeys.length - 1]
      }
      return null
    },
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang='less' scoped>
.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 5px;
}

.input-new-tag {
  width: 120px;
}
</style>
